Ow! My Brain!
Most optical illusions can be broken once you know what you’re looking for. You can see how lines have been drawn to mislead the eye; you can focus on one spot for long enough to overcome whatever distracting element has been included; you can, in genera, unfool yourself.
Following the break is a beautifully simple illusion that I cannot break. I’ve tried. I put it into photoshop to verify that it’s genuine and it is.
Damn my brain.
The trick here? The blue and green are the same colour. Check it yourself in paint. Same colour.
My brain hurts.